01
What are the main OOP concepts in Java?
Show answer
Encapsulation, inheritance, polymorphism and abstraction. Testers use them to build reusable page classes, base tests and utility libraries.
Happiest Minds Technologies Automation Testing Interview Questions & Answers
Curated interview practice questions with answers. These are practice scenarios, not a verified list of past interview questions.
About Happiest Minds Technologies hiring for Automation Testing roles
Happiest Minds Technologies is a Bengaluru-based IT services company focused on digital transformation work such as product engineering, cloud, data analytics, cybersecurity and automation. It was founded by Ashok Soota and serves clients in edtech, retail, manufacturing and banking. In India it hires freshers and experienced professionals for development, testing, data and infrastructure roles, with an emphasis on digital skills.
For Automation Testing roles, this Happiest Minds Technologies practice set focuses most on Core Java for Testers (10), Git, Maven and Jenkins (6), REST Assured (6), Performance Testing with JMeter (4). It has 17 easy, 21 medium, 2 hard questions, so you can start easy and work up to the harder ones.
- Company type
- IT services
- Headquarters
- Bengaluru, India
- Main India offices
- Bengaluru, Noida
Happiest Minds Technologies Automation Testing interview process
- Online assessment (aptitude + technical MCQs)
- Coding test
- Technical interview
- Managerial or HR round
Typical pattern based on public candidate experiences. Rounds vary by role, team and year.
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02
Difference between ArrayList and LinkedList?
Show answer
ArrayList has fast random access and slower inserts in the middle; LinkedList has fast inserts and deletes but slow access by index.
03
What does a good commit message look like?
Show answer
A short summary line under about 60 characters in the imperative mood, like "Add retry for flaky payment test", followed by a blank line and a body explaining why the change was made if not obvious. Reference the ticket ID. Small focused commits with clear messages make reviews faster and help when using git log or git bisect to find when a test broke.
04
What is method overriding and where is it useful in frameworks?
Show answer
A subclass redefines a parent method. Frameworks use it to customise base behaviour, such as overriding a wait or click method in a base page class.
05
What is the difference between == and equals() in Java?
Show answer
== compares references (or primitive values); equals() compares content when overridden, as in String.
06
How do you manage test environments for a CI pipeline?
Show answer
Keep environment details in config files or environment variables per env, never in code. Prefer ephemeral environments created per pull request with containers, seeded with known data and destroyed afterwards. For shared environments, reserve them through the pipeline, reset data before runs and monitor health with a pre-test check so tests do not fail due to a down service.
07
What are JMeter listeners and why should you avoid most of them during a load run?
Show answer
Listeners collect and display results, such as View Results Tree, Summary Report and Aggregate Report. Visual listeners keep every sample in memory and redraw graphs, which consumes a lot of CPU and RAM and can make JMeter itself the bottleneck. During real load runs disable them, run in non-GUI mode, write raw results to a JTL file and generate the HTML dashboard afterwards. Use View Results Tree only for debugging.
08
What is ITestContext in TestNG and how can you use it to share data?
Show answer
ITestContext represents one test tag from testng.xml and is passed to listeners and configuration methods. It holds the suite, included methods and results, and has setAttribute and getAttribute to share values, such as an auth token created in @BeforeTest and read by later classes. Because it is shared by every thread in that test tag, store only thread-safe or read-only data there, not WebDriver instances during parallel runs.
09
What is the difference between git merge and git rebase?
Show answer
Merge combines branches by creating a merge commit, keeping the full history exactly as it happened. Rebase replays your commits on top of another branch, producing a straight, linear history without a merge commit. Rebase is good for tidying a local feature branch before a pull request; never rebase commits that others have already pulled, because it rewrites history.
10
Write Java code to find the second largest number in an integer array.
Show answer
public static int secondLargest(int[] nums) {
int first = Integer.MIN_VALUE, second = Integer.MIN_VALUE;
for (int n : nums) {
if (n > first) {
second = first;
first = n;
} else if (n > second && n != first) {
second = n;
}
}
if (second == Integer.MIN_VALUE) throw new IllegalArgumentException("No second largest");
return second;
}
11
What is the Page Object Model?
Show answer
A design pattern where each page is a class holding its locators and actions, so tests stay readable and a locator change is fixed in one place.
12
What is data-driven testing?
Show answer
Running the same test logic with multiple data sets from Excel, CSV, JSON or a database, so coverage increases without duplicating code.
13
What are exceptions and how do you handle them?
Show answer
Runtime events that disrupt flow. Use try-catch-finally, throw, throws, and custom exceptions; checked exceptions must be handled while unchecked ones need not be.
14
How do you switch between native and webview contexts in a hybrid app?
Show answer
// Requires the webview to be debuggable in the app build
Set<String> contexts = driver.getContextHandles();
for (String ctx : contexts) {
if (ctx.startsWith("WEBVIEW")) {
driver.context(ctx);
break;
}
}
driver.findElement(By.cssSelector("#email")).sendKeys("qa@test.com");
// back to native controls
driver.context("NATIVE_APP");
15
How do you record videos of tests running on a Docker Selenium Grid?
Show answer
Add the selenium/video image as a sidecar container next to each node, sharing the node's display through DISPLAY_CONTAINER_NAME, and mount a folder for the mp4 files. Newer Grid versions also support recording per session by setting the se:recordVideo capability with Dynamic Grid. Name videos with se:name so they match test names. Keep videos only for failed tests or for a few days, because they use a lot of disk space.
16
What is BDD and how does Cucumber work?
Show answer
Behaviour-driven development writes scenarios in Given-When-Then Gherkin that map to step definitions in code, so business and QA share one language.
17
What is contract testing?
Show answer
Verifying that a provider and consumer agree on request and response formats, using tools like Pact, to catch breaking changes early.
18
What is a BasePage and what should it contain?
Show answer
BasePage is a parent class for all page objects holding common things: the driver reference, a WebDriverWait, and helper methods such as click with wait, type, getText, waitForVisible and scrollIntoView. Child pages extend it and stay focused on page-specific locators and actions. Keep it small; if it grows into hundreds of methods, move helpers into separate utility classes using composition.
19
What is serialization and deserialization in REST Assured?
Show answer
Serialization converts a Java object (POJO) into JSON for the request body; deserialization converts the response JSON back into a Java object. REST Assured does this automatically when Jackson or Gson is on the classpath: body(userPojo) serializes and response.as(User.class) deserializes. Using POJOs gives type safety, IDE support and cleaner assertions compared with hand-written JSON strings.
20
What is git stash and when would you use it?
Show answer
git stash saves uncommitted changes and cleans the working directory so you can switch branches. Later, git stash pop reapplies them. Use it when you are halfway through a change and must quickly fix something on another branch. git stash list shows saved stashes, and git stash push -m "msg" names them. For longer work, a temporary commit on a branch is clearer.
21
What is the difference between throw and throws?
Show answer
throw actually raises an exception object inside a method; throws declares in the method signature that it may pass an exception to the caller.
22
What is performance testing and what are its main types?
Show answer
Performance testing checks how fast, stable and scalable a system is under a given workload. Load testing measures behaviour at expected traffic. Stress testing pushes beyond capacity to find the breaking point and how the system recovers. Spike testing applies sudden jumps in users. Soak or endurance testing runs normal load for hours to find leaks. Scalability testing checks whether adding resources increases capacity as expected.
23
What is dryRun in Cucumber and when do you use it?
Show answer
dryRun=true makes Cucumber parse all feature files and check every step has a matching definition without actually executing anything. It is fast and is useful after writing new features, during refactoring, or as a quick CI gate to catch undefined or ambiguous steps. It also prints snippets for missing step definitions that you can paste and implement.
24
What is correlation in JMeter and why is it needed?
Show answer
Correlation means capturing dynamic values from one response and passing them into later requests. Session ids, CSRF tokens, auth tokens and order ids change every run, so a recorded script with hard-coded values fails on replay. In JMeter you use post-processors such as JSON Extractor, Regular Expression Extractor or CSS Selector Extractor to save the value into a variable, then reference it as ${token} in later headers or bodies.
25
How do you verify response time and headers in REST Assured?
Show answer
Use then().time(lessThan(2000L)) and then().header("Content-Type", containsString("json")) along with body assertions.
26
Your framework throws NullPointerException in a page object on the first action. What are the likely causes?
Show answer
The driver was never initialised or was passed as null, for example a page created before setup ran or a static driver not yet assigned. With PageFactory, initElements may not have been called, so @FindBy fields are null. A config value read from a properties file may also be missing. Check the stack trace line, then fix the setup order and add null checks with clear messages.
27
What is REST Assured?
Show answer
A Java library that makes API tests readable using given-when-then, with easy request building, response validation and JSON path support.
28
What is the difference between imperative and declarative Gherkin?
Show answer
Imperative Gherkin lists UI actions: enter username, enter password, click submit. Declarative Gherkin states intent: Given a registered customer is logged in. Declarative steps are shorter, survive UI changes and are understood by business people; the UI detail lives in step definitions and page objects. Imperative style is acceptable only when the exact interaction is the behaviour being tested.
29
What are Maven profiles and how do you use them in automation?
Show answer
Profiles are sets of configuration activated by name, such as -Pqa or -Pstaging, or by conditions. In automation they switch environment URLs, suite files, browsers or parallel settings without changing code. For example a regression profile sets suiteXml to regression.xml and threadCount to 4. Combined with properties files, profiles keep one codebase for every environment.
30
Tests on the Grid fail with SessionNotCreatedException saying the new session request timed out. What do you check?
Show answer
It means no matching free slot appeared in time. Check the Grid UI to see whether nodes are registered and whether their capabilities match the request, such as browser name, version or platform. Compare the test thread count with total slots, since extra threads just wait in the queue. Look for stuck sessions holding slots after aborted builds. Then increase capacity, reduce threads, or raise the session request timeout.
31
Your price comparison test fails because 19.99 + 0.01 is not equal to 20.0. Why?
Show answer
double uses binary floating point, which cannot represent many decimal values exactly, so small rounding errors appear. For money, use BigDecimal created from strings and compare with compareTo(), or compare doubles with a tolerance such as Assert.assertEquals(actual, expected, 0.001). Also strip currency symbols and commas before parsing UI text.
32
What is the difference between git fetch and git pull?
Show answer
git fetch downloads new commits and branches from the remote but does not change your working files; you can inspect them with git log origin/main. git pull is fetch followed by merge (or rebase if configured) into your current branch. Fetch is safer when you want to review changes before integrating them.
33
How do you log requests and responses in REST Assured?
Show answer
Use given().log().all() for the full request and then().log().all() for the full response. To reduce noise, use log().ifValidationFails() on both, which prints only when a test fails. For a whole suite, set RestAssured.enableLoggingOfRequestAndResponseIfValidationFails() or add RequestLoggingFilter and ResponseLoggingFilter in a shared spec. Mask tokens and passwords before logs reach CI.
34
How do you extract a value from one response and use it in the next request?
Show answer
String token = given().body(creds).when().post("/login")
.then().statusCode(200)
.extract().path("token");
given()
.header("Authorization", "Bearer " + token)
.when()
.get("/orders")
.then()
.statusCode(200);
35
Write the command to run a JMeter test in non-GUI mode and generate the HTML report.
Show answer
# -n non-GUI, -t test plan, -l results file, -e -o HTML dashboard folder
jmeter -n -t tests/checkout.jmx \
-l results/checkout.jtl \
-e -o results/html-report \
-Jusers=100 -Jrampup=60 -Jduration=600
# generate a report later from an existing JTL
jmeter -g results/checkout.jtl -o results/html-report-2
36
Write a GET test in REST Assured.
Show answer
given().baseUri(url)
.when().get("/users/1")
.then().statusCode(200).body("id", equalTo(1));
37
What is a .gitignore file and what should an automation project ignore?
Show answer
A .gitignore lists files Git should not track. In a Java automation project ignore target/, test-output/, allure-results/, reports, screenshots, logs, IDE folders like .idea and .vscode, *.iml, OS files like .DS_Store, and local config files holding secrets. Ignoring generated output keeps the repository small and avoids noisy diffs and conflicts.
38
Difference between an abstract class and an interface?
Show answer
An abstract class can hold state and concrete methods; an interface defines a contract (with default methods since Java 8). A class extends one abstract class but can implement many interfaces.
39
Mobile tests pass on the emulator but fail on a low-end real device. How do you investigate?
Show answer
Low-end devices are slower, so fixed waits and short timeouts expire before screens render. Replace sleeps with explicit waits and increase timeouts sensibly. Check for vendor-specific pop-ups, battery optimisation dialogs or different keyboards on that brand. Compare screen size and resolution, since coordinate-based taps break. Collect device logs with adb logcat and screen recordings to see what the app was doing. Also check whether the app crashed due to low memory.
40
A login action can lead either to the dashboard or to an error message. How should the page object method return?
Show answer
Make the outcome explicit with separate methods instead of one method guessing. For example loginAs(user) returns DashboardPage for valid credentials, while loginExpectingError(user) returns the same LoginPage so the test can check the error. Each method waits for its expected page and fails clearly if it does not appear. This keeps tests readable and avoids returning a generic Object or checking types in tests.
Tips to crack the Happiest Minds Technologies Automation Testing interview
- Prepare one programming language deeply along with SQL, and be ready to write and explain small programs during the technical round.
- Highlight any hands-on work in cloud, analytics, security or automation, since the company positions itself around digital-only services.
- Read about the company's people-first culture and values so your answers on teamwork and learning sound genuine.
- Keep a one-minute story ready for every project on your CV: problem, your part, tools, result.
- Practise the hard questions on this page aloud; Happiest Minds Technologies interviewers usually ask follow-ups on your first answer.
Frequently asked questions
How many rounds are there in the Happiest Minds Technologies Automation Testing interview?
Candidates usually go through 4 stages: Online assessment (aptitude + technical MCQs); Coding test; Technical interview; Managerial or HR round. The exact rounds change with the role, team, location and your experience, so confirm the process with the recruiter.
Which topics should I prepare for the Happiest Minds Technologies Automation Testing interview?
This practice set leans on Core Java for Testers (10), Git, Maven and Jenkins (6), REST Assured (6), Performance Testing with JMeter (4). Revise those first, then practise explaining one or two of your own projects end to end, because most Happiest Minds Technologies interviewers ask you to walk through real work.
Are these the exact questions asked at Happiest Minds Technologies?
No. These are curated practice questions that match the skills and difficulty usually tested in it services interviews like Happiest Minds Technologies's. They are not a leaked or verified list of past questions.
Where does Happiest Minds Technologies hire Automation Testing professionals in India?
Happiest Minds Technologies has large teams in Bengaluru, Noida. Openings and locations change often, so check the Happiest Minds Technologies careers page and filter by city and experience.
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